Air-feeding device for



UNITED STAT S PATENT OFFICE,

GEORGE R. URIDGE, OF DETROIT, MICHIGAN.

AIR-FEEDING DEVICE FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 393,800, dated December 4, 1888.

Application filed M91011 7, 1338- To all whom it may concern.-

Be it known that I, GEORGE R. URIDGE, a citizen of the United States, residing at Detroit, in the county of \Vayne and State of Michigan, have invented certain new and useful Improvements in Air-Feeding Devices for Furnaces, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to new and useful improvements in air-feeding devices for furnaces, especially intended for steam-generators, for the purpose of producing a smokeless combustion.

The invention consists in the peculiar arrangement and construction of air-feedin g de vices in the bridge-wall, by means of which air is introduced from the outside underneath the fire, as well as back of the bridge-wal1,in connection with mechanical means comprising a series of steam-jets for forcing such air to the points desired and in such quantities as to effect the purpose of smokeless combustion.

To this end my invention consists in the construction and arrangement of the parts, as more fully-hereinafter described, and shown in the accompanying drawings, in which- Figure 1 is a longitudinal central section of a steam-generator furnace with the bridgewall constructed to embody my invention. Fig. 2 is a cross-section thereof on line 00 x in Fig. 1.

A represents a transverse air-flue built in the bridge-wall, and provided on one or. both sides of the furnace with an adjustable door or doors to control the admission of air into said flue. This flue continues into the flue B and connects therewith by proper passages, and

in that flue is located the steam-head O, which I preferably construct in the form of two pipes, one inside the other, and forming an interior and exterior steam-chamber, separated from each other, connected to the steam-supply pipes E and F, and provided with regulating-valves G G, by means of which either one of the steam-chambers can be independently connected with steam-supply from the steamdome or other source. This steam-head Chas two sets of nozzles or jets, H and I, the former of which discharges the steam through the apertures J in the bridge-wall directly under- Serial No. 268,628. (No model.)

neath the fire-grate, which is of any suitable construction; but instead of having the usual air-supplies from the front of the boiler through the ash-pit doors it is supplied with oxygen by the pressure of the steam injected through the apertures .I, which draw the air in through the flue A into the flue B, and

thence underneath the grate,where a plenum of air is maintained, which passes through the interstices in the grates to the fire to maintain the combustion. The other set of steam nozzles or jets, I, take the steam from the other chamber of the steam-head, and, passing in an upward direction, discharge it into a flue, K, into which the air is conducted through a separate inlet-flue, Ii, from the outside, and which flue is also provided with a suitable draft-door for regulating the admission of air thereto. From this flue K the passage or discharge-opening M on top of the bridge-wall forces the air underneath the boiler at such point where it strikes the heated gases escaping from the grate at their point of greatest heat, and eomminglin g therewith produces entire combustion of all gases not consumed, producing thereby an extended flame passing rearwardly under the generator, and from there on following the draft. To further admit air into this flame or combustion, I preferably discharge air from the flue L into the rearward flue, N, which has suit able apertures, O, to discharge an amount of air back of the bridge-wall to further support combustion.

hat I claim as my invention is 1. In an air-feeding device for furnaces, the combination, with the bridge-wall and the steam-head provided with two independent steam-chambers, of two air flues or passages from said steam-head, each independent of the other, one discharging into the furnace below the grate and the other on top of the bridge-wall into the sheet of flame or gases of combustion passing over that bridge-wall, substantially as described. I

2. In an air-feeding device for furnaces, the combination, with the bridge-wall, of two air flues or passages, each independent of the other, one discharging into the furnace below the grate and the other on top of the bridgewall into the sheet of flame or gases of combustion passing over that bridge-wall, and

the steam-head common to both and provided with independent means of control, substantially as deserihed.

3. In an air-feedingdeviee forfnrnnces, the eomhimition, with the bridge-wall, of the airtlnes A 13, the draft-door controlling the admission of air thereto, the steam-head provided with two independent stealn-ehzinihers, the passages J, leading into the furnace, and

the passages leading through the top of the IQ bridge-wall, substantially as described.

In testimony whereof I aflix my signature, in presence of two witnesses, this Hth day of March, 1888.

GEORGE R. FRIDGE. \Vit nesses:

1. M. IIULBERT, JOHN SCHUMAN. 

